<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        //fuction
        //没有返回值
    function say(){
        console.log("没有返回值");
    }
    say();
    //有返回值
    function eat(){
        return "吃"
    }
    console.log(eat());
    
    </script>
</body>
</html>